/usr/lib/rpm/macros.perl is in rpm-common 4.12.0.1+dfsg1-3build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Perl specific macro definitions.
# To make use of these macros insert the following line into your spec file:
# %include %{_rpmconfigdir}/macros.perl
%define perl_sitelib %(eval "`perl -V:installsitelib`"; echo $installsitelib)
%define perl_sitearch %(eval "`perl -V:installsitearch`"; echo $installsitearch)
%define perl_archlib %(eval "`perl -V:installarchlib`"; echo $installarchlib)
%define perl_privlib %(eval "`perl -V:installprivlib`"; echo $installprivlib)
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